The Sigfox SDR dongle is the hardware platform on which to run the Sigfox Device Test Suite, a comprehensive device developer software toolkit:

The Network Emulator: Developed to test end-to-end and bidirectional data transport services between your device and your application

The Radio Signal Analyzer: Developed to test radio compliance with Sigfox Verified certification requirements
SDR dongle will accelerate adoption of Sigfox technology for partners all across the world, says Laetitia Jay, Chief Marketing Officer at Sigfox. We feel excited that Digi-Key now provides essential developer tools for quick starting, prototyping and fast developing scalable IoT solutions.

The Sigfox SDR dongle is a powerful and configurable radio Receiver and Transmitter emulating the Sigfox network. It is the easiest way for device and solution makers to speed up development and tests, without the need for network coverage and for every country's radiofrequency configuration.